Head, however, praised Sharapova's "honesty" and "courage" in a statement outlining plans to continue paying Sharapova to use its rackets.

The statement said: "For more than a decade Maria Sharapova has been a role model and woman of integrity who has inspired millions of fans around the world to play and watch tennis. The honesty and courage she displayed in announcing and acknowledging her mistake was admirable."

"Head is proud to stand behind Maria, now and into the future, and we intend to extend her contract," the statement added. "We look forward to working with her and to announcing new sponsorships in the weeks and months ahead."